Get the last Tap info
The number of tap for this particular event. 1 for single-tap, 2 for double-tap and so on.
the screen position of the cursor for click/single finger event. For multi fingers event, this is the position between the two fingers
boolean flag indicate if the input type is a mouse input.
unique index indicate which touch/mouse input trigger the event. This is so an event by a particular touch can be keep tracked when there are multiple event on screen.